The author makes an incorrect assessment without considering the appropriate context for China.
The gaping hole in his assessment of "Chinese cultural exports" is the failure to account for China's population and GDP per capita, which currently is only about $17k PPP. This is no position to be exporting culture to the globe from; that would just be a waste of resources. Culture is a result of being rich, not a cause of being rich.
In other words, China is not "culturally-stunted" than any other country with a similar GDP per capita PPP.
Chinese culture is also all in the Chinese language, and China has no strategic reason to make any effort to export it globally into English, a foreign language, where fitting translations would cost even more resources.